The Ngram Viewer will let you compare using multiple words or names in one chart. The example that I provide in this video is to compare the use of the terms “National Parks,” “National Forests,” and “National Forest Service.” By taking a look at the Ngram Viewer for those terms I can see that they begin to appear more regularly around 1890, have a lull in the 1940s and 1950s, and after that appear more frequently again in the 1960s..
Ngram Viewer is based upon books indexed in Google Books. That is why below every graph generated by Ngram Viewer you will discover a list of books about each of your search terms. Those books are arranged by date..
A third part of Ngram Viewer to keep in mind is that it works with numerous languages including English, French, Chinese, German, Italian, Russian, Hebrew, and Spanish..

By the method, the book that I mentioned in the video is That Wild Country by Mark Kenyon..

Applications for Education.
As I pointed out in the video above, the Ngram Viewer can provide an excellent way to begin a research study activity for trainees. Have them go into a few words then examine the chart to determine peaks and valleys in the frequency of the words use. Then inquire to attempt to determine what would have triggered those words to be utilized more or less frequently at different periods in history.

Ngram Viewer is a search tool that trainees can use to explore the use of words and names in books released between 1800 and 2019. The Ngram Viewer reveals users a chart highlighting the first appearance of a word or name in literature and the frequency with which that word or name appears in literature since 1800. The Ngram Viewer will let you compare the usage of multiple words or names in one graph.

Googles.
Ngram Viewer is a search tool that trainees can use to explore the usage of words and names in books published in between 1800 and 2019. The Ngram Viewer reveals users a chart showing the very first look of a word or name in literature and the frequency with which that word or name appears in literature given that 1800. The graph is based on the books and regulars that are indexed in Google Books.